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cannot create the runnable JAR file containing 3rd party JAR files

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  cannot create the runnable JAR file containing 3rd party JAR files www <xsli2@yahoo.com> - 2011-12-21 12:03 -0800
    Re: cannot create the runnable JAR file containing 3rd party JAR files markspace <-@.> - 2011-12-21 14:23 -0800
      Re: cannot create the runnable JAR file containing 3rd party JAR files www <xsli2@yahoo.com> - 2011-12-21 17:29 -0800
    Re: cannot create the runnable JAR file containing 3rd party JAR files Roedy Green <see_website@mindprod.com.invalid> - 2011-12-22 02:22 -0800

#10937 — cannot create the runnable JAR file containing 3rd party JAR files

Dear All:

My directory structure is the following:
libs/externa/  containing a.jar, b.jar
libs/installed/  the generated runnable JAR file, "sample.jar", will
be here

src/ containing Java source files
build/ containing Java class files
The main class is x.y.z.MyMain

I have had a really hard time to create a runnable JAR file using
Ant(version 1.6.5). The JAR file, libs/installed/sample.jar, can be
generated. However, when I run it, the classes inside a.jar or b.jar
are not available and causes NullPointerException. When I un-tar
sample.jar, everything is there. I think manifest classpath is causing
the problem.

Following is my brief build.xml:

	<filelist id="external.jars" dir="libs/external">
		<file name="a.jar" />
		<file name="b.jar" />
	</filelist>
	<path id="project.classpath">
		<pathelement location="./build" />
		<filelist refid="external.jars"/>
	</path>

	<target name="build" depends="init">
		<javac debug="true" debuglevel="${debuglevel}" destdir="$
{build.dir}" source="${source}" target="${target}">
			<src path="src" />
			<classpath refid="project.classpath" />
		</javac>
	</target>

	<target name="jar" depends="clean, build">
		<pathconvert property="manifest.classpath" pathsep=" ">
			<mapper>
				<chainedmapper>
					<!-- remove absolute path -->
					<flattenmapper />

					<!-- add libs/external prefix -->
					<globmapper from="*" to="libs/external/*" />
				</chainedmapper>
			</mapper>
			<path>
				<filelist refid="external.jars"/>
			</path>
		</pathconvert>

		<jar destfile="libs/installed/sample.jar" basedir="./build"
update="true">
			<manifest>
				<attribute name="Main-Class" value="x.y.z.MyMain" />
				<attribute name="Class-Path" value="${manifest.classpath}"/>
			</manifest>
			<fileset dir="${externals.dir}"/>
		</jar>
	</target>

Thank you very much.

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#10938

On 12/21/2011 12:03 PM, www wrote:

> I have had a really hard time to create a runnable JAR file using
> Ant(version 1.6.5). The JAR file, libs/installed/sample.jar, can be
> generated. However, when I run it, the classes inside a.jar or b.jar
> are not available and causes NullPointerException. When I un-tar
> sample.jar, everything is there. I think manifest classpath is causing
> the problem.
>


Could you show us the actual error message?  It would help.  Also when 
the error occurs, if there aren't too many lines in between the launch 
and the error message.

Also please show us the Java command line itself and the contents of the 
Jar and manifest file.

Like this:

Brenden@Kageyama ~/Dev/proj/hw/dist
$ java -jar hw.jar
Hello world!  <<-- you would have an error message here instead

Brenden@Kageyama ~/Dev/proj/hw/dist
$ jar -tf hw.jar
META-INF/
META-INF/MANIFEST.MF
hw/
hw/Hw.class

Brenden@Kageyama ~/Dev/proj/hw/dist
$ jar -xf hw.jar META-INF/MANIFEST.MF

Brenden@Kageyama ~/Dev/proj/hw/dist
$ ls
META-INF  README.TXT  hw.jar

Brenden@Kageyama ~/Dev/proj/hw/dist
$ cat META-INF/MANIFEST.MF
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.2
Created-By: 1.7.0-b147 (Oracle Corporation)
Class-Path:
X-COMMENT: Main-Class will be added automatically by build
Main-Class: hw.Hw


> 		<pathconvert property="manifest.classpath" pathsep=" ">
> 			<mapper>
> 				<chainedmapper>
> 					<!-- remove absolute path -->
> 					<flattenmapper />


Neat, I learned something new.

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#10941

Thank you for the reply. I just found this link. My problem is exactly
same as his:

http://stackoverflow.com/questions/3770071/including-external-jar-files-in-a-new-jar-file-build-with-ant

Another related link is:
http://stackoverflow.com/questions/3143567/cannot-find-main-class-in-file-compiled-with-ant/3144290#3144290

I have not carefully studied/tried the posted answers yet. One issue
is that our Ant version is 1.6.5. The ant tag "zipgroupfileset" is
only available for Ant 1.7 or newer.

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#10944

On Wed, 21 Dec 2011 12:03:22 -0800 (PST), www <xsli2@yahoo.com> wrote,
quoted or indirectly quoted someone who said :

>The JAR file, libs/installed/sample.jar, can be
>generated. However, when I run it, the classes inside a.jar or b.jar
>are not available and causes NullPointerException

see http://mindprod.com/jgloss/jarlinking.html
-- 
Roedy Green Canadian Mind Products
http://mindprod.com
If you can't remember the name of some method, 
consider changing it to something you can remember.
 

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